Low-temperature CH4 Catalytic Combustion over Pd Catalyst Supported on Co3O4 Nanocrystals with Well-Defined Crystal Planes

We report a novel strategy to prepare supported Pd catalysts for low-temperature methane combustion. The structure-property relationship of the catalysts was investigated by tuning the shape and crystal planes of supporting Co3O4 nanocrystals. Pd/Co3O4 nanosheets are more reactive than Pd/Co3O4 nanobelts and nanocubes with the same Pd loading. The strong surface interaction between the Co3O4 unit cell and the PdO unit cell on {112} crystal plane of Pd/Co3O4 nanosheets has been analyzed by using high resolution transmission electron microscopy and temperature programmed reduction experiments.